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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f7cd388ad8b6841c7f273b40a01f035bf4af6f8389275bb031e4e6e5fe60a0a' 
  AND token = '9XSTn6ChT6cpVZiFTQygTj1g58+ZRCzkfGUIN+FL02s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}